Modulator for electromagnetic signals transmitted by a contactless transmission/reception system
CA 2429331 C · Owner: Ask S.A. · Inventors: Parrault, Olivier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a device for transmitting data by means of electromagnetic wave radiation in a contactless transmission/reception system to a contactless object. The data bits transmitted correspond to the alternation of a first time interval during which the electromagnetic waves are transmitted at a pre-determined carrier frequency and a second cut-off time interval during which the transmission of electromagnetic waves at the pre-determined carrier frequency is cut-off. According to the invention during said second cut-off time interval generation means (40, 42, 44, 46, 48) are used to generate electromagnetic waves having a frequency that is double the pre-determined carrier …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 13, 2002 and granted August 28, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 13, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 13, 2024.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.